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DS/C/Lab/Week5/PostfixToInfix.c

@@ -0,0 +1,56 @@
+
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_SIZE 100
+#define MAX_EXPR_LEN 200
+
+char stack[MAX_SIZE][MAX_EXPR_LEN];
+int top = -1;
+
+void push(const char* item) {
+    if (top >= MAX_SIZE - 1) {
+        printf("Stack Overflow\n");
+        return;
+    }
+    strcpy(stack[++top], item);
+}
+
+char* pop() {
+    if (top < 0) {
+        printf("Stack Underflow\n");
+        return NULL;
+    }
+    return stack[top--];
+}
+
+int isOperator(char c) {
+    return (c == '+' || c == '-' || c == '*' || c == '/' || c == '^');
+}
+
+void postfixToInfix(const char* postfix) {
+    char op1[MAX_EXPR_LEN], op2[MAX_EXPR_LEN], temp[MAX_EXPR_LEN];
+    
+    for (int i = 0; postfix[i] != '\0'; i++) {
+        if (!isOperator(postfix[i])) {
+            temp[0] = postfix[i];
+            temp[1] = '\0';
+            push(temp);
+        } else {
+            strcpy(op2, pop());
+            strcpy(op1, pop());
+            sprintf(temp, "(%s%c%s)", op1, postfix[i], op2);
+            push(temp);
+        }
+    }
+    
+    printf("Infix expression: %s\n", stack[top]);
+}
+
+int main() {
+    char postfix[MAX_SIZE];
+    printf("Enter postfix expression: ");
+    gets(postfix);
+    postfixToInfix(postfix);
+    return 0;
+}